已知数列{An}满足=2An-1+2^n-1(n属于正整数,n大于等于2)且A4=81.求数列前三项A1.A2.A3的值题目绝对没错
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![已知数列{An}满足=2An-1+2^n-1(n属于正整数,n大于等于2)且A4=81.求数列前三项A1.A2.A3的值题目绝对没错](/uploads/image/z/1358500-4-0.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7BAn%7D%E6%BB%A1%E8%B6%B3%3D2An-1%2B2%5En-1%28n%E5%B1%9E%E4%BA%8E%E6%AD%A3%E6%95%B4%E6%95%B0%2Cn%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E2%29%E4%B8%94A4%3D81.%E6%B1%82%E6%95%B0%E5%88%97%E5%89%8D%E4%B8%89%E9%A1%B9A1.A2.A3%E7%9A%84%E5%80%BC%E9%A2%98%E7%9B%AE%E7%BB%9D%E5%AF%B9%E6%B2%A1%E9%94%99)
已知数列{An}满足=2An-1+2^n-1(n属于正整数,n大于等于2)且A4=81.求数列前三项A1.A2.A3的值题目绝对没错
已知数列{An}满足=2An-1+2^n-1(n属于正整数,n大于等于2)且A4=81.求数列前三项A1.A2.A3的值
题目绝对没错
已知数列{An}满足=2An-1+2^n-1(n属于正整数,n大于等于2)且A4=81.求数列前三项A1.A2.A3的值题目绝对没错
用递推公式
a4=2a3+2^4-1=81 a3=33=2a2+2^3-1
a2=13=2a1+2^2-1 a1=5
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